/* Basic reset */
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
:root {
  --bg: #0a0e1a;
  --card: #111827;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --primary: #10b981;
  --primary-hover: #059669;
  --warning: #f59e0b;
  --warning-hover: #d97706;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --border: #1e293b;
  --border-light: #334155;
  --surface: #1e293b;
  --overlay: rgba(15, 23, 42, 0.8);
}
/* Light theme tokens */
html[data-theme="light"] {
  --bg: #fafbfc;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --primary: #059669;
  --primary-hover: #047857;
  --warning: #d97706;
  --warning-hover: #b45309;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --surface: #f8fafc;
  --overlay: rgba(255, 255, 255, 0.9);
}
/* System (follow prefers-color-scheme) */
@media (prefers-color-scheme: light) {
  html[data-theme="system"] {
    --bg: #fafbfc;
    --card: #ffffff;
    --text: #1e293b;
    --muted: #64748b;
    --primary: #059669;
    --primary-hover: #047857;
    --warning: #d97706;
    --warning-hover: #b45309;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --surface: #f8fafc;
    --overlay: rgba(255, 255, 255, 0.9);
  }
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography scale */
h1 { font-size: 1.875rem; font-weight: 700; line-height: 1.3; }
h2 { font-size: 1.5rem; font-weight: 600; line-height: 1.4; }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.4; }

@media (max-width: 768px) {
  h1 { font-size: 1.625rem; }
  h2 { font-size: 1.375rem; }
  h3 { font-size: 1.125rem; }
  body { font-size: 15px; }
}
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  backdrop-filter: blur(12px);
  z-index: 100;
  min-height: 64px;
}

.settings-only {
  background: transparent;
  border: 1px solid var(--border);
  padding: 8px;
  border-radius: 8px;
  font-size: 16px;
  min-height: 36px;
  width: 36px;
}

@media (max-width: 768px) {
  .app-header {
    padding: 12px 16px;
    min-height: 56px;
  }
  
  .settings-only {
    min-height: 40px;
    width: 40px;
    padding: 10px;
  }
}
.brand { display: flex; gap: 12px; align-items: baseline; }
.app-title { font-weight: 700; letter-spacing: 0.2px; }
.muted { color: var(--muted); }

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 16px;
}

@media (max-width: 768px) {
  .container {
    padding: 16px 12px;
  }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  backdrop-filter: blur(8px);
}

@media (max-width: 768px) {
  .card {
    padding: 20px 16px;
    margin-bottom: 20px;
    border-radius: 12px;
  }
}

.banner {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--text);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.success-banner {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: var(--text);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
  text-align: center;
  font-weight: 500;
  animation: fadeInSlide 0.5s ease-out;
}

@keyframes fadeInSlide {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .banner {
    padding: 14px 16px;
    margin-bottom: 20px;
  }
}

/* Undo Toaster */
.undo-toaster {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(12px);
  z-index: 1000;
  animation: slideUp 0.3s ease-out;
}

/* Hide undo toaster when hidden attribute is present */
.undo-toaster[hidden] {
  display: none !important;
}

.undo-toaster-btn {
  background: var(--primary);
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  min-height: 32px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.undo-toaster-btn:hover {
  background: var(--primary-hover);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

@media (max-width: 768px) {
  .undo-toaster {
    left: 16px;
    right: 16px;
    transform: none;
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  }
  
  @keyframes slideUp {
    from {
      opacity: 0;
      transform: translateY(10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* Sectioned Grid */
.grid-section {
  margin-bottom: 32px;
}

.section-header {
  margin: 0 0 16px 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

@media (max-width: 768px) {
  .section-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

/* All Caught Up State */
.all-caught-up-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.all-caught-up-card h2 {
  margin: 0 0 8px 0;
  color: var(--primary);
}

.all-caught-up-card p {
  margin: 0;
}


.level-tile {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--card);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.level-tile:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Heatmap color coding for level tiles */
.level-tile.overdue {
  border-color: var(--danger);
  box-shadow: 0 1px 3px rgba(239, 68, 68, 0.2);
}

.level-tile.due-today {
  border-color: var(--warning);
  box-shadow: 0 1px 3px rgba(245, 158, 11, 0.2);
}

.level-tile.due-soon {
  border-color: rgba(245, 158, 11, 0.5);
  box-shadow: 0 1px 3px rgba(245, 158, 11, 0.1);
}

.level-tile.future {
  border-color: var(--primary);
  box-shadow: 0 1px 3px rgba(16, 185, 129, 0.1);
}

@media (max-width: 768px) {
  .level-tile {
    padding: 14px;
    gap: 10px;
  }
}
.level-head { display:flex; align-items:center; justify-content: space-between; }
.level-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 12px;
  border-radius: 8px;
  padding: 6px 10px;
  background: var(--surface);
  border: 1px solid var(--border-light);
  color: var(--text);
  min-width: 32px;
}

.due-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--warning);
}

@media (max-width: 768px) {
  .level-badge {
    font-size: 13px;
    padding: 8px 12px;
    border-radius: 10px;
    min-width: 36px;
  }
  
  .due-badge {
    font-size: 12px;
    padding: 6px 10px;
    border-radius: 8px;
  }
}

.level-body .label { font-size: 12px; color: var(--muted); }
.level-body .value { font-variant-numeric: tabular-nums; }

/* Mark Done Button */
.mark-done-btn {
  margin-top: 12px;
  width: 100%;
  font-size: 14px;
  padding: 10px 16px;
  min-height: 40px;
}

/* Hide mark done button when hidden attribute is present */
.mark-done-btn[hidden] {
  display: none !important;
}

/* Past Due Badge */
.past-due-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--danger);
}

@media (max-width: 768px) {
  .past-due-badge {
    font-size: 12px;
    padding: 6px 10px;
    border-radius: 8px;
  }
  
  .mark-done-btn {
    min-height: 44px;
    padding: 12px 20px;
    font-size: 15px;
  }
}



button {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 500;
  font-size: 14px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

button.primary {
  background: var(--primary);
  color: white;
  border-color: transparent;
  font-weight: 600;
}

button.primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

button.warning {
  background: var(--warning);
  color: white;
  border-color: transparent;
  font-weight: 600;
}

button.warning:hover:not(:disabled) {
  background: var(--warning-hover);
}

button.danger {
  background: var(--danger);
  color: white;
  border-color: transparent;
  font-weight: 600;
}

button.danger:hover:not(:disabled) {
  background: var(--danger-hover);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

@media (max-width: 768px) {
  button {
    min-height: 48px;
    padding: 14px 20px;
    font-size: 15px;
  }
}

/* Focus styles for accessibility */
*:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

button:focus,
input:focus,
select:focus,
[tabindex]:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
}

button:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

.field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  margin-bottom: 4px;
}

.field span {
  font-weight: 500;
  color: var(--text);
}

.file-btn {
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: 12px;
  cursor: pointer;
  background: var(--card);
  color: var(--text);
  font-weight: 500;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.file-btn:hover {
  background: var(--surface);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

select {
  appearance: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--text);
  min-height: 36px;
  font-size: 14px;
  cursor: pointer;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
  background-position: right 8px center;
  background-repeat: no-repeat;
  background-size: 16px;
  padding-right: 32px;
}

select:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-color: var(--primary);
}

/* Additional spacing for reset button */
#resetBtn {
  margin-top: 8px;
}

@media (max-width: 768px) {
  .field {
    min-height: 48px;
  }
  
  .file-btn {
    min-height: 48px;
    padding: 14px 20px;
  }
  
  select {
    min-height: 44px;
    padding: 12px 16px;
    padding-right: 40px;
    font-size: 15px;
  }
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 20px 0;
}

/* Dialog styles */
dialog {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  padding: 0;
  max-width: 400px;
  width: 90vw;
}

dialog::backdrop {
  background: var(--overlay);
  backdrop-filter: blur(4px);
}

.settings-form {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 300px;
}

.settings-form h3 {
  margin: 0 0 4px 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.settings-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.settings-actions button,
.settings-actions .file-btn {
  flex: 1;
  min-width: 120px;
}

menu {
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: flex-end;
}

menu button {
  background: var(--surface);
  border: 1px solid var(--border);
}

@media (max-width: 480px) {
  dialog {
    width: 95vw;
    max-width: none;
  }
  
  .settings-form {
    padding: 20px;
    min-width: unset;
  }
  
  .settings-actions {
    flex-direction: column;
  }
  
  .settings-actions button,
  .settings-actions .file-btn {
    flex: none;
    width: 100%;
  }
}


/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  button:hover {
    transform: none;
  }
  
  .level-tile:hover {
    transform: none;
  }
}